Lock or block your door between 8-12 and silence your phone. Once you are in a better place with the baby, kick him the F out.
But before you do that: gather and make copies of all the important paperwork, all inflow and outgo. His paystubs, your taxes, bank balances, do a deep dive to see if any money is coming out the accounts that shouldn't be. Don't forget any credit cards, bank loans, automobile payments and maintenance, travel, vacations. Dinner for his friend. Be as thorough as you possibly can be with the money.
Make a spreadsheet, and separate the expenses by categories, children toys, treats, medical, your own medical, diapers (and don't forget how much the cost of diapers over time goes up, add it in, projected costs), groceries, laundry soap, and other household items, like bandaids, paper towels, enter it all into a spreadsheet, medical, insurance, house mortgage or rent, gardening, water, utilities, clothing, heating, cooling, oil changes, alcohol, does he go out? Make a column. Vehicle, petrol, upkeep, insurance, parking, tolls, tokens, rides, trains, subscriptions, everything. If breathing costs money, give it it's own column. Check your receipts, check his receipts. Bank records, go back in time to do this, at least one year, two is preferable. Look at all the bank records. Is there money going out you didn't know about? Every dime is accounted for and is in a column of an expenses spreadsheet. You will need this later when you separate.
Notate exactly how much time he spends with the children every single day. Notate his interaction with them. You will be glad you have this information later.
Do it slowly, take your time, but do it. Hide your information, lock the file with a password then hide the file in nested folders, hide two password protected copies online. Once you have clarity about the money find a solicitor who specializes in women to file an action for a divorce.